Steam stamp or hammer



(No Model.) 2 Sheets-Sheet 1.

N. W OONDIOT, Jr. STEAM STAMP on HAMMER.

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(No Model.) 2 Sheets-Sheet 2.

I N. W. GONDICT, Jr.

STEAM STAMP 0R HAMMER.

N0..275,360. Patented Apr. 10,1883.

u. PETERS, mmwulm mr. Washington. a. a

. I UNITED STATES PATENT OFFICE.

NATHAN W. OONDICT, JR., OF JERSEY CITY, NEW JERSEY.

STEAM STAMP OR HAMMER.

SPECIFICATION forming part of Letters Patent No. 275,360, dated April 10, 1883. Application filed September 18, 1882. (No model.)

T 0 all whom it may concern;

Be it known that I, NATHAN W. CoNmcT, J r., a citizen of the United States, and a resi-- dentof Jersey Oity,New Jersey, have invented certain Improvements in Steam Stamps or Hammers, of which the following is a specification.

My invention consists of certain mechanism, fully described hereinafter, for the automatic operation of the valves of that class of duplex steam-stamps in which the descent of the stamp-rods is due to the pressure of steam on the piston of each cylinder, and their ascent to constant action of steam at a lower pressure against the under side of the pistons.

In the accompanying drawings, Figure 1, Sheet 1, is a front view, partly in section, of part of a duplex steam-stamp, illustrating my invention; Fig. 2, an enlarged view of part of Fig. 1; Fig. 3, a sectional plan of part of Fig. 1. on the line 1 2; Fig. 4, Sheet 2, a rear view, partly in section, the main valves being omitted in order to show the ports; Fig. 5, a top view, partly in section; Fig. 6, a sectional plan on the line 3 4, Fig. 1; Fig. 7, a sectional perspective view illustrating part of .the valvemotion, and Figs. 8 and 9 modifications of part of the valve-operating device.

A hollow casting, A, is secured to the top of and forms a part of a frame, (not deemed necessary to exhibit in the drawings,) and within this casting is a chamber, A, into which extend portionsof two cylinders, B B, each of the latter being provided with a piston and piston-rod connected to a stamp-rod, and the two stamp-rods O 0 being arranged to slide in guides secured to the frame. The lower portions of the stamp-rods operate in mortarscontaining the minerals or other materials to be crushed. Steam at a low pressure just sufficient to raise, with the required rapidity, the stamp-rods, pistons, and piston-rods is always maintained in the chamber A when the machineis in operation,for which purpose I generally use a small steam-pipe, 0, provided with a valve weightedto blow 0d at the desired pressure. Each cylinder is provided with a steam-chest, D, containing a valve, preferably an ordinary slide-valve, attached to a valve spindle, a, a piston, 1), contained in a small cylinder, E, being secured to or forming a part of the said spindle, and the small cylinder being attached'to a suitable frame, (I, secured to the casting A. I

The seat of'the valve of each of the cylinders B and B has two ports, 6 and f, the former affording, when the valve permits it, a communication between the interior of the cylinder above the piston and the valve-chest, to which steam from the boiler is directed through a pipe,g, and the exhaust-portf, forming a communication between the atmosphere and the interior of the cylinder above the piston through the port-e, the recess of the valve, and an exhaust-passage communicating with a suitable exhaust-pipe.

The chest of the small cylinder E contains an ordinary slide-valve, h, adapted to ports similar to those of the steam-cylinder of an ordinary steam-engine, the valve having two rods, h h, each of which terminates in or is attached to a slide. 3, adapted to guides j on the frame 01, in which is also guided a vertical rod, k,having an inclination, It, bearing against a roller, 1, on the slide of the valve-rod. (See Fig. 4.) The character of these guides will be best understood by reference to the enlarged sectional perspective view, Fig. 7.

The operation of the valve of. the small engine is due to the alternating reciprocating motion of the two vertical rods k k, each of which is connected by a link to an arm, n, on a rock-shaft, F, Fig. 4, which has its hearings in the frame cl,and to which is secured another arm, 'n, Fig. 1. The arm n of one rock-shaft F is connected by a rod,p, to one end, and the arm n of the other rock shaft F is connected by a similar rod to the other end of a lever, Gr, which is secured midway between its opposite ends to a rock;shaft, H, having its hearings in a hanger, H, secured to the casting A, and on the same shaft-,H, is a segment, I, on the edge of which a brake-shoe, l, preferably mounted with leather, is caused to bear by spiral springs. Thedetailed construction of this brake mechanism will be described hereinafter.

To the segment I or to the shaft H is secured the lever J, having two arms,q q, one of which projects over the flange r on the stamp-rod '0, the other project-ing over the flange r of the stamp-rod 0, each flan ge preferably forming'a part of the coupling by which the pistonrod is secured to the stamp-rod. In

Fig. l the flange r, as the stamp-rod O was completing its upward movement, has struck the arm q of the lever J, and through the connections described has admitted the steam to the small cylinder to the right of the piston, thereby so operating the valves of the cylinders B and B that steam will be admitted through the port 0 to the cylinder B above the piston while the steam above the piston of the other cylinder, B, is being exhausted. The consequence of this will be the instant descent of the stamp-rod O, the ascent of the stamp-rod O, the striking of the arm q of the lever J, the reversal of the valves, the descent of the rod 0, and the ascent of the rod O. Thus as one stamp-rod rises the other is forced downward, and blow after blow is imparted by the stamp to the mineral or other material in the two mortars.

I have found in practice that by arranging each arm of the lever J in respect to the flange of the stamp-rod in the manner shown in Fig. 3that is, a short distance from a centralline, 2 2-there will bea tendency of the arm, when struck, to turn the said stamp-rod to a limited extent, and this is desirable, for good results are attained by turning the stamp at intervals.

The object of the friction device is to prevent an excess of movement of the lever J. I prefer to construct the device in the manner shown in Fig. 2, on reference to which it will be seen that the brake-shoe I is pivoted midway between its opposite ends to a block, 1 which is free to slide vertically in a projection on the casting A. On each side of this sliding block a spiral spring, .3, is interposed between the under side of the casting A and a support, t, which can be screwed in or out of the shoe 1; hence by turning these supports the springs can be made to press the brakeshce with more or less force on the segment I.

1 furnish the valve-rod a, forming the piston-rod of the small cylinder, with two disks, a a, one disk striking a projection, b, on the valve-chest of the cylinder B when the valve is moved in one direction, and the other disk striking a similar projection on the valvechest of the cylinder B when the valve is moved in a contrary direction. In other words, the projections serve as buffers to limit the movement of the piston, and consequently of the valves of the main cylinders, recesses in the projections being packed with leather or other equivalent material.

Referring to Fig. 4, it will be observed that the valve of the small cylinder is never free, being always under the control of and locked by and between the two vertical rods 7c; and although the lever J is attimes free during the operation of the machine, it is so restrained by the above-described friction device that there can be no movement ofthe rods k k, and consequently no movement of the valve of the small cylinder other than the positive motion derived from the stamp-rods. This plan of locking the valve of the small cylinder at all times by the device through the medium of which the valve is operated is a special element in my invention, and may be accomplished in different ways. For instance, it is not essential that there should be two rods 75, for a single rod having two inclinations, as shown in Fig. 8, and acting on two rollers on a single slide, may be substituted for the two rods, each having a single inclination, as will be readily understood without further description. A cam for thus operating and locking the valve may be used, as shown in Fig. 9.

While slide-valves are preferred in connection with the main cylinders, other kinds of valves may be made available for performing the functions of the slide-valves.

I claim as my invention 1. The combination, in duplex stamps in which the descent of the stamp-rod is due to the pressure of steam on the pistons of the cylinders, and their ascent to steam at a lower pressure, of the following elements, namely: first, two cylinders having connected valves; second, a small cylinder the piston of which is secured to or forms a part of the valve-spindles of the two cylinders; third, a valve-operating and valvelocking device; and, fourth, mechanism whereby the stamprods or piston-rods of the main cylinders are caused to operate the said device, all substantially as set forth.

2. The combination of the valves of the two main cylinders, a small cylinder, E, having a piston connected to both valves, with a reciprocating rod or rods, 70, having inclinations for acting on the valve spindles, and with mechanism whereby the stamp-rods or piston-rods of the main cylinders are caused, to operate the said rod or rods k, substantially as set forth.

3. The combination of the valve-spindle of the small cylinder, the guided rod or rods it, having inclinations for acting on the said valve spindle, with the flanges r on the stamprods or piston-rods of the main cylinders, the lever J, and mechanism for connecting the said lever to the rod or rods is, substantially as set forth.

4. The combination of the lever J, and valve-operating mechanism connected thereto, with a friction device for restricting the movement of said lever, substantially as described.

5. The combination of the-rock-shaft H, the lever J, and segment I with the brake-shoe I, the sliding block to which the shoe is pivoted, and adjustable springs for forcing the shoe against the segment, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

NATHAN W. GONDIOT, JR.

Witnesses HARRY DRURY, HARRY SMITH. 

